Air-brush.



O. C. WOLD.

AIR BRUSH.

APPLICATION FILED MAY 24, 1915.

Patented J an. 25, 1916.

3 SHEETS-SHEET 1- magma ($4M z/mdd O. C. WOLD.

AIR BRUSH.

APPLICATION FILED MAY 24, 1915.

Patented J an; 25, 1916.

3 SHEETSSHEET 2- mwm O. C. WOLD.

AIR BRUSH.

APPLICATION fILED MAY 24, 1915.

l mma? Patented Jan. 25, 1916.

f .flf 3 SHEETS-SHEET 3.

oLAUs c. worn, or cnrcaeo, ILLINOIS.

AIR-BRUSH.

n eaaea.

Specification of Letters Patent.

Application filed May 24, 1915. Serial No. 30,078.

To all whom-it may concern Be it known that L'OnAus C. Won), a citizenof the United States, residing. at Chicago, Cook county, Illinois, haveinvented certain new and useful Improvements in Air-Brushes; of whichthe following is a specification.

' The present invention has reference to im prover'nents in air brushesand has particular reference to improvements in that type of air brushintended for comparatively heavy or coarse work, although it will appearthat certain features of the invention are in no I wise limited to thisparticular class of service.

The main objects of the invention are to provide a construction ofsimple design and arrangement in which. a. common trigger will serve toopen, the air valve and thereafter the needle valve so as to insure adelivery of air before the pigment commences to How. Also in thisconnection to so arrange the parts that'after the air valve has beenopened the amount of needle valve opening may be controlled so as todeliver a larger or smaller stream of pigment accordmg to the desires ofthe operator.

Another object is to provide a construction such that the needle can beeasily removed either for replacement or repair, without in' any mannerinterfering with the adjustment and assemblage of the other parts. Thisis a feature of considerable importance for the reason that it may bedesirable to regrind the needles from time to time, or to insert anotherneedle of different form or size.

Still another feature of the invention has reference to the constructionof the trigger whereby the air and needle valves are controlled. objects.in this connection being to so form thetrigger that it can be readilyinserted into or withdrawn from the barrel of the instrument without thenecessity of using-special tools..

Another feature .of the invention has reference to the provision of amechanical construction such that the trigger can be .Very' convenientlymanipulated bv a finger of the hand which grasps the handle of theinstrument, thus making it possible to manipulate the instrument in amanner very similar to the manipulation of a pistol or revolver.

Other obiects and uses will appear from a detailed description of theinvention which consists in the features of construction andcombinations of parts hereinafter described and claimed.

Referring to the drawings, Figure 1 shows a side elevation of theassembled instrument, the instrument being provided with a jar forcarrying the color or pigment; Fig. 2 is a view similar to that of Fig.1, with the L the general arrangement of the air and pigment passages;Fig. 6 is a section taken on the line 66 of Fig. 3 looking in thedirection of the arrows; Fig. 7 'is a section taken on the line 7-7 ofFig. 4 looking in the direction of the arrows; Fig. 8 shows a horizontalsection through the barrel of the instrument and discloses particularlythe air connection from the air valve to the nozzle; and Fig. 9 is anenlarged detail section of the tip of the instrument.

Referring to the several figures the instrument comprises a barrelportion 10 to the rear end of which is connected the handle 11 and tothe front end of which is connected the pigment supply pipe 12. Thehandle is conveniently formed from a tubular member 13, the upper end ofwhich threads onto a. nipple 14 extending down from the barrel, and thecentral portion of which carries a grip 15 of fiber or other suitablematerial. The tubular member 13 carries a finger rest a or the like 16at its upper end so that when connection 17 to which the air hose may beconnected. The bore of the upper portion of the member 13 issufficiently large to accommodate the air valve 18. the construction ofwhich is shown in detail in Figs. 3 and .4. hen the air in the hosewhich is at-v tached to the connection 17 is turned on the outside ofthe valve 18 1s sub1ected to air pressure.

'lPatented Jan. 25, 1916.

' the lug 14 to the barrel.

Referring to Figs. 3 and 4 the air valve 18 comprises a bushing 19, theupper end of which carries a lug 20 which threads into the lug.14, andthe lower end of which carries a hollow nut 21. The movable member ofthe valve comprises a pin 22 seating snugly in a central perforation ofthe lug 20, and having the circular flange 23 near its'lower end.Beneath the circular flange 23 is the lug 24 which seatswithin thespring 25. The lower end of this spring rests against the hollow nut 21,which nut keeps the spring under compression for the purpose of raisingthe valve into the closed position shown in Fig. 3.

The pin 22, immediately above the flanged portion 23, is of reduceddiameter, as shown at 26, so that when the valve pin is forced downagainst the spring the air can pass up around said reduced diameterportion into the passage 27 which extends up. through As shown in Figs.7 and 8, this passage partly encircles the bar rel, and connects bymeans of a tube 28 with an annular air space 29 near the forward end ofthe barrel. A plurality of perforations 30 deliver the air from thespace 29 to the space contained within a cap 31 on the front end of theinstrument.

In the lower portion of the barrel is the slot 32 within which works thetrigger 33 and the lever 34. This lever is pivoted at the point 35 andhas a pin 36 which limits its upward travel. The pin 22 presses upagainst the lower face ofthe lever finger and when the air valve isclosed holds said finger substantially in the position shown in Fig. 5.The forward face 37 of the lever is tapered or slanted substantially asillustrated in Figs. 3, 4 and 5, for the purpose presently to bedescribed.

The trigger has the hook 38 on its upper end, said hook having a slotwhich faces forward and receives the pin 39 extending across the barrel.The lower end of the trigger has the finger piece 40 whereby it may bemanipulated by the forefinger. It

will be seen from the foregoing that rnanipulation of the trigger inthis way will keep its upper end properly hooked onto the pin 39provided the resistance to be overcome is applied against the centralportion of the trigger.

The rear end of the barrel has the hollow nut 41, the inner and outerfaces of which are threaded. Inside of this nut there is threaded ahollow bushing 42, the rear portion 43 of the bore of which bushing isof enlarged size. This bushing. being connected rigidly to the barrel,constitutes, in effect, a stationary abutment. Inside ofthe said bushingis a sleeve 44, the forward end of which carries an enlarged head 45,and the rear end of which has applied thereto the cap 46. A spring 47,interposed between .or initial position.

Inside of the sleeve 44 is another sleeve 48, the forward end 49 ofwhich is of enlarged size and works nicely inside of the sleeve 44, andthe rear end of which works freely through a perforation in the cap 46.

A relatively light spring 50 seats between the sleeves 44 and 48, andexerts a pressure between the enlarged head 49 at one endand the cap 46at the other. The 'rear end 51 of the sleeve 48 is threaded and carriesa flange 52 which may seat against the'abutment when the sleeve 48 is inits extreme forward position. Furthermore said end 51 is split and itsthreads are tapered so that a nut 53 threaded onto said end will clampthe split portion together.

The needle rod 54 extends through the body of the sleeve 48, through thehead 45, and through a slot 55 in the central portion of the trigger,and then extends forward into the front portion of the barrel. The frontend of said needle rod works in a tapered cap 56 which closes the space57 in connection 12. The needle rod works nicely through a bushing 59 soas to preyent a back flow of pigment and so as to prevent a suction intothe space 57 when the instrument is being used. I

From the foregoing description it will appear that upon forcing thetrigger backward the pressure so exerted on the head 45 will force backthe sleeve 44 against the force of the spring 47. Owing to the force ofthe spring 50 there is a tendency for the sleeve 48 to be carriedforward, and such forward movement may be arrested by the engagement ofthe flange 52 against the abutment. It will be noted from an examinationof Fig. 3 that in the position therein illustrated the enlarged portion49 of the sleeve 48 does not contact with the head 45 of the sleeve 44,and neither does the cap 46 contact with the flange 52 in said position.It therefore follows that as the sleeve 44 commences its backward travelthe sleeve 48 will remain stationary for the time being,

.the spring 50 meanwhile expanding'so as to Sitluned with respect to thelever 34 that almost as soon as the backward movement of said headcommences itwill engage-the face 87 of the'lever and cause the lever totilt down into theposition illustrated in Fig. 4. T hereupon the airvalve will be opened and the supply of air will commence. When the airvalve has been fully opened the head i5 will ride over the edge of theface 37, maintaining the air valve locked in the open position. As soonas this occurs the lost motion previously described will have been takenup, and from that time on the sleeve 48 will be forced back in case thetrigger be drawn farther back.

By reason of the clamping connection obtainable through the use of thenut 53., the needle rod can be locked to the sleeve -18 at any desiredposition of the needle rod with respect to said sleeve. It is thuspossible to lock the needle rod at such position with respect to thesleeve 18 that when said sleeve is restored to its forward position theneedle valve will be entirely 'closed to shut off the supply of'pigment. On the other hand as soon as the sleeve 18 begins to travelbackward the needle valve will commence to open and the amount of suchopening may be readily controlled by manipulation of the trigger,meanwhile maintaining the air valve fully opened for the full supply ofair. By this arrangement it is possible to secure a "cry nice andaccurate control of pigment flow.

Ordinarily the rear portion of the mechanism will be closed by a hollowcap 59, which nevertheless may be provided with a perforation throughwhich the needle rod and nut 53 may work. Oil introduced through theopening 61 above the trigger will find its way down onto the trigger andalso onto the needle rod so as to work along said rod into the movingparts which are illustrated in Figs. 3 and 4. In Fig. I

I have shown a jar 62 as threaded onto the connection 12,, whereas inFig. 2 l have shown a pipe 63 threaded onto said connection, and it maybe held rigid by means of a plate 64: extending across to the lower endof the handle. This latter type of construction is well adapted for usein those cases where relatively large surfaces are to be rapidlycolored.

While I have herein shown and described only a single embodiment of themain features of my invention, still it will be understood that I am notlimited to the same except as I may limit myself in the claims.

1 claim: I

1. in a device of the class described the combination with a suitablecasing, of a pigment connection in the forward portion of the casing, ahandle downwardly depending frcnrthe rear portion of the casing, saidhandle being hollow and provided with an air connection at its lowerend, an air valve in the upper portion of the handle, a nozzle on thefront end of the device, a connection from'the pigment connection tosaid nozzle,

a needle rod for controlling the nozzle, a sleeve slidably mounted onthe needle rod, means for clamping said sleeve to the needle rod at anydesired position of adjustment, a

second sleeve outside of. the first mentioned sleeve, a spring actingbetween said sleeves and tending to carry the first mentionedcombination with a suitable casing having a pigment connection inits'forward portion and an air valve in its rear portion, of a needlerod for controlling the delivery of pigment from the pigment connection,a sleeve slidably mounted on the needle rod, means for securing saidsleeve to the rod at any desired position of adjustment, a second sleeveslidably mounted on the first mentioned sleeve, a spring acting betweensaid sleeves and tending to carry the first mentioned sleeve forward andthe second mentioned sleeve backward, an abutment, a spring actingbetween the second mentioned sleeve and the abutment and tending tocarry said sleeve forward, a trigger, an operative connection betweenthe trigger and the second mentioned sleeve, and an opera= tiveconnection between the second mentioned sleeve and the air-valve.

3. In a device of the class described the combination with a suitablecasing, ofa pigment connection in the forward portion of the same, anair valve in therear portion of the casing, a needle rod for controllingthe delivery of pigment from the pigment connection, a sleeve slidably.mounted on the needle rod, means for securing said sleeve to the needlerod at any desired position of adjustment, a second sleeve slidablymounted on the first mentioned sleeve, a. spring acting between saidsleeves and tending to carry the first mentioned sleeve forward and thesecond mentioned sleeve rearward, there being cooperating parts on saidsleeves to limit the extent of such relative movement, an abutment, aspring acting between said abutment and the second mentioned sleeve andtending to carry said sleeve forward, an operative connection betweenthe second mentioned sleeve and the air valve, and means for operatingthe sec- 'ond 'mentioned sleeve against the force of the secondmentioned spring, the parts I. being relatively so proportioned thatwhen the second mentioned sleeve is operated the air valve opens beforethe relative movement between the two sleeves ceases.

4; In a device of the class described the combination with a suitablecasing, of a pigment valve in the forward portion of the same and an airvalve in the rear portion of the casing, a needle rod for controllingthe opening of the pigment valve, a sleeve slidably mounted. on theneedlerod, means for securing said sleeve to the needle rod at anydesired position of adjustment, a second sleeve slidably mounted on thefirst mentioned sleeve, a spring acting between both of said sleeves andtending to carry the first and tending to carry said sleeve forward,

a lever pivoted to the casing and acting on the air valve, a triggermounted in position to engage the second mentioned sleeve, and a partcarried by the second" mentioned sleeve in position to engage theleverfor the purpose of rocking the same to thereby open the air valvewhen the rearward movement of the second mentioned sleeve commences,

.the parts being so proportioned that the lever is fully rocked beforethe completion of the relative movement between the two sleeves.

5. In a device of the class described the T combination with a suitablecasing, of a pigment valve in the forward portion of the same, an airvalve in the rear portion of the casing, a needle rodfor controlling theopening of the pigment valve, a part se cured to the needle rod, asleeve slidably' mounted with respect to said part, a spring actingbetween thesleeve and said part and i tending to carry the needle rodforward and the sleeve rearward, means for limiting the extent of suchrelative movement, an abutment, a spring acting between the abutment andthe sleeve and tending to carry the sleeve forward, a trigger mounted inposi- 5 tion to engage the sleeve to move the same rearward against saidspring, a lever pivoted to the casing and mounted in position to engagethe air valve, and a part on the sleeve, adapted to engage the lever torock the same when the movement of the sleeve against its springcommences, the parts being so proportionedflthat the lever is fullyrocked before the relative'movement between the needle rod and thesleeve 0 ceases.

6. In a device of the class described the combination with a suitablecasing, of a pigment valve in the forward portion of the same and an airvalve in the rear portion of the casing, a needle rod for controllingthe opening of the pigment valve, a part carried by the needle rod, amember slidably mounted with respect to said -part,

a'spring acting between the part and the slidable member and tending tocarry the part forward and the slidable membertrearward, an abutment onthe casing, a spring acting between said abutment and the slidablemember tending to carry the slidable member forward, a trigger mountedin position to actuate the slidable member rearward against said spring,a lever pivoted to the casing and acting on the air valve, and

a part carried by the slidable member and adapted to engage the lever torock the same for opening the air valve, the parts being relatively soproportioned and adjusted that the lever will be fully rocked to openthe air valve before the relative movement between the member and theneedle rod ceases.

y o. c. oLn.

\Vitnesses FRANCES FRos'r, THOMAS A. BANNING, Jr.

